#app {
  background-color: #f90;
  border: 1px solid black;
}

#app .container {
  font-size: 30px;
}

#app span {
  color: pink;
  font-size: 20px;
}

#app a {
  text-decoration: none;
  color: green;
}

#app a:hover {
  color: wheat;
  font-size: 50px;
}

#app h2 {
  color: aquamarine;
  font-size: 20px;
}

#app .div {
  width: 200px;
  width: 1200px;
  background-color: green;
}

#app .div:after {
  content: "";
  display: table;
  clear: both;
}
